Windshield cleaning apparatus



. Jan. 20, 1959 L. c. DERMOND 2,869,165

WINDSHIELD CLEANING APPARATUS Filed June e, 1956 e sheets-sheet 1 E 7- 9H A INVENToR. LAWRENCE 6. DEH/10H0 Jan. 20, 1959 c. DERMOND 2,869,165

WINDSHIELD CLEANING APPARATUS Filed June 6, 1956 6 Sheets-Sheet 2 3,8 p l f5 7j l' 43 /`&- l

, y* il jira f4 7 f/ 73 j f l 76 5a 77 I j HI8 ATTORNEY Jan. 20, 1959 L. c. DERMOND 2,869,165

WINDSHIELD CLEANING APPARATUS Filed June e, 1956l e sheets-sheet s Jan. 20, 1959 L.. c. DE-RMOND 2,869,165

WINDSHIELD CLEANING APPARATUS Filed June 6, 1956 6 Sheets-Sheet 4 0) J/ f5 49 .MHZ f2 INVENToR. AHRE/VCL' C. 05E/10170 BY 3/ D. C. s

H/.s M70/mfr Jan. 20, 1959 l.. c. DERMOND 2,869,165

WINDSHIELD CLEANING APPARATUS Filed June 6, 1956 6 Sheets-Sheet 5 I INVENToR. Mh//f/VCE C. DEH/70H0 Jan. 20, 1959 L. c. DERMOND 2,869,165

WINDSHIELD CLEANING APFIARATUS Filed June 6,1956 6 Sheets-Sheet 6 INVENTOR. LAWHf/VCf QDfRNOA/D BY D C. S

H/.s farmnmfy United States .Patent @fra A General YMotors Corporation, Detroit, Mich., a corporation of Delaware ApplicationJune V6, 19'56,`Seral No.1589,'754

,14.Claims. ,(Cl. 15-250.4)

Thislinventionfpertains to'fthe` art of windshieldcleaninggandf'particu'larly to ailuid pressure operatedwiper ^motor` having coordinator means ,for leffecting concurrent operation'of a wiper motor andiawasher pump.

Heretofore, Vdevices for'etfectingcoordinated operation of afwindshield' wiper `motor-and a washer `pump have been 'developed and marketed. These devices are independent of-the wiper motor'and the washer pump and functionto initiate wiper motor operationconcurrently with, or shortly after, thedelivery strokeoffthe pump. 'Aftercompletion of the washer `delivery stroke, the coordinatingdevice continues operation of the wiper'motor fora timed interval so as to dry the windshield, this ordinarily being accomplished bydashpot Ymeans. The present invention pertains to coordinator means for uid :pressure operated Wiper motors and Washer pump wherein `the coordinator 'meansare formed withan integral component of the wiper motor. Accordingly, among my 'ob- 'jects 4are theprovision'of means for coordinating the Aoperation of fluid pressure operated 'wiper motor fmeans and a Vfluid, pressure operated washer pump; thefurther provision of means for effecting automatic'and coordinated Yoperation of a fluid pressure operated wiper lmotor and 'a-Washer pump; the further provision of meanslfor' timv`ing the operation-of afluidpressure operated wiper motor after the delivery stroke of a Washerpumpis completed; and they still further provision of'means for timingV the entire interval of wiper motor operation after initiating the wash cycle.

The aforementioned and other objects areaccomplished in the present invention by incorporatingV servo actuated means in the wiper motor assembly for effecting coordinated operation of a Wiper vmotorand a washer. VSpeci- 'cally, the wiper motor,per se, is of the type disclosed in my copending applications Serial Nos.409,332, led February l0, 1954, now'Patent No. 2,789,544, 4and 513,- l5179, tiled June 6,4955. Accordingly, both embodiments of the instant invention ofthe wiper motor includes a cylinder having `a reciprocable piston therein Vcapable yoffluid pressure actuation in both directions. vThe piston carries servo .actuated ,reversing valve means which -are :automatically t :operated adjacent the normal strokef ends of theL piston, anda manual control valve is reciprocably -mounted-within the cylinder for controlling lthe lspeed 'ofmotor operation and for parking the motor piston `beyond one of itsnormal stroke ends.

Inthe preferred embodiment,`the coordinatingvmeans `aredesignedffor use with awasher pump having a fluid pressure actuatedxintake stroke ;and a spring actuated delivery-stroke. The coordinatoriand timing means includes afspring-biased plunger. havinga bleedporifice in theihead rthereof. When :the :manual `control valve is v.depressed for automatic washer-wiper operation, lthe plunger .is moved-by iluidfunderpressure to compress the spring and thereby complete the flow path'to initiate operation .of the wiper motor. At'the same time7 the intake-stroke of thewasher pump is effected and .whenithe :manual control knob is released, the delivery stroke of the pump Fatenteddan. V20, `1959 yll C@ commences-andoperation of the Wiper-motorl is timed by the spring-biased plungerl and bleed orice therein which nconstitute'dashpot means. In this embodiment, the entire 'cycle-ofwiperrnotor operation is timed, and since the A passage between the -pl-ungerand the manual control valve 4iseclosedfby -a lcheckvalve, the plunger'returnsto its normal position under the urge of the spring and when it -ismoved toits'normal position,v the wiperA motor will A-stopiin itsparked position where it is biased-bygpressure -`fluid. Preferably, the wiper Vmotor completes vseveral v strokes after completion of the-pump delivery stroke so as to dry the windshield.

In the'second embodiment, -the` coordinating means are designed for -use :with va' washerpump having afspring actuated intake "fstroke and a `uidfpressurefeffected def'livery stroke. `'The 'coordinator' and timingz means,` like- -wise,-includes ajspringbiased Yplunger yhaving a bleed ori- `-flceein thevheadvthereof,this mechanism'being similar to f that disclosed in-copendingapplication, Serial No. 526,294,

Kelley, et al., led August 3, 1955, and assigne'dto the :assigneeof this invention. vIn thesecond embodiment, the

`controlvalve must be continually depressed to complete the delivery stroke-of the -Washerpump "In so doing, the spring-biasedplungeris'moved, compressing the spring f and completingtheiflow-rpath to thewasherv-pump and 'the wiper'imotor. -Upon completion of the pump delivery stroke, thetotal uidjpressures Vacting on opposite sides #of 'thelplunger Willbecome equal, and the spring will Islowlyemove the plunger toits Anormal position, thereby vtiming operation of-the wiper `motor/onlyaftercornpletion of thee-pump delivery stroke. Thereafter, the pump "intake spr-ingvi/ill-lforce -thelluid to drain.

"Further objects'and advantages -of theypresent invention Lwilli-beam;arent from the 'following description, reference Vbeing had'rto `the accompanying Vdrawingswherein pre- -`ferred-embodirnents of thef present invention-are 'clearly shown.

Fig. f4 is anY end View in elevation taken in thedirection of1arrow-4 in-l Fig.' l.

'Fig` 5 is a sectional Vview taken along `line 5 5 of Fig. 6 is aneenlar'ge'd sectional 'viewtaken-alongline l-Tign7is'a` fragmentary sectional view of; the V'washer pump designe'd for use -with"the Aassembly .of fFigs. l throughf.

Vl-TigzIS lis-a view,l ineelevation, of theA second '-ernbodimen .fftheawiper'motor and washer actuator assembly.

"Fig 9Sis ran eenlarged longitudinal `sectional'view Vof thelsecond'embodirnent of theassembly.

iFig."10\-is an enlargedsectional viewtakenalong line Sith-i1() of -1Fig.8.

IFigl lfis an end'view in'elevationtaken' inthe. direction 'ofsarrow-:Il inFig.V1 8.

.il-ig. :l2i'is..a sectional .View taken along line "l2-12 lof Fig. .11.

Fig. 1'4; is :.a f fragmentary 'sectional `view Vof the-washer rpurnp :designed for :use .with :the .assembly of Figs. 8 `through 13.

With particular. referenceV to: Figs. 'il through i6,f`the pre ferred embodiment of the ,windshieldfwiper-.rnotor and washer actuator Will be described. The wiper motor in,`

cludes a body, or housing, 20, the ends of which are closed by plates 21 and 22. The housing 20 has a bore 23, as shown in Fig. 2, constituting a working cylinder. A reciprocable piston 24 is disposed within the cylinder bore 23 and divides the bore into a pair of opposed eX- pansible chambers 25 and 26. As seen in Fig. 6, the piston 24 carries a rotatable trunnion 27 having a diametrical opening 28 therethrough which receives a crank arm 29 attached to an oscillatable output shaft30. One end of the shaft 30 extends outside of the housing 20, as shown in Fig. 3, and has a channeled shaped connector 31 attached thereto. The housing 20 is also formed with a manual control valve bore 32, which is spaced from but parallel with the cylinder bore 23. The valve bore, or

guide, 32 is connected with the cylinder bore 23 by a plurality of passages 33, 34 and 35, as seen in Fig. 2. A manually operable control valve 36 is mounted for reciprocable movement within the valve guide 32.

The piston 24 is formed with a transversely extending bore or valve guide 37, within which a servo actuated reversing, or shuttle valve, 38 is disposed. In addition, the piston has formed therein passages 39, 40, 41 and 42, which cooperate with passages 33, 34, 35, 43, 44 and 46 in the housing 20.

The control valve 36 is formed with spaced sealing lands 48, 49, 50, 51 and 52. The lands 48 and 49 are separated by a throttling surface 53; the lands 49 and S0 are separated by an annular groove 54; the lands 50 and 51 are separated by an annular groove 55; and the lands 51 and 52 are separated by an annular groove 56. As seen in Fig. 3, iluid under pressure is supplied to the housing through port 57, which connects with the valve guide through passage 58. The valve guide 32 is connected by a passage 59 with a port 60 communicating with the cylinder bore 23. The port 60 always communicates with a piston passage 61 connecting with a pressure inlet port 62 in the valve guide 37. In addition, the valve guide 37 includes outlet ports 63 and 64, which are connected, respectively to cylinder chambers and 26. In addition, the valve guide 37 is connected with a pair of drain passages 65 and 66, which communicate at all times through the piston 24 with a drain port 66a. Moreover, in accordance with the teachings of the aforementioned Serial No. 513,519, the lower end of the valve guide 37 is connected to the cylinder chamber 25 through passage 67 and the upper end of the valve guide 37 is connected to cylinder chamber 26 through passage means 68. In addition, with the piston 24 in the position of Fig. 2, the upper end of valve guide 37 is connected to drain through a passage 69. When the piston 24 is at the other end of its working stroke, the lower end of valve guide 37 is connected to drain through a groove 47 in the cylinder bore 23 that communicates with the drain cavity 66b of the piston 24 and the drain port 66a.

The piston 24 is shown in its parked position in Fig. 2, that is, the piston is positioned beyond one end of its normal running stroke, and the control valve 36 is in the off position. When the control valve 36 is moved to the right, as viewed in Fig. 2, so as to interconnect passages 34 and 35 through the annular groove 55, pressure fluid from passage S8 will flow through passage 33, and passages 40, 41 and 39 to passage 34, through annular groove 55 to passage 35 so as to move the reversing valve 38 upwardly. In this instance, uid under pressure from supply port 62 is admitted to cylinder chamber 25, while cylinder chamber 26 is connected to drain through port 64, port 66 and drain port 66a. Accordingly, the piston 24 will move to the left, as viewed in Fig. 2'. As the piston 24 approaches the end plate 22,'the passage 42 will communicate with passage 43, and pressure iiuid will ow from passage 58 through passages 33, 39, 41, 42, 43, 44 and 46 to the upper end of the valve guide 37 so as to move the reversing valve 38 downwardly. Accordingly, cylinder chamber 26 will be connected to 4pressure from pressure inlet port 62 through port 64 and 4 cylinder chamber 25 will be connected to drain. Thus, the piston 24 will move to the right and will be maintained in a state of continuous reciprocation. The speed of piston reciprocation is determined by the position of the throttling surface 53 relative to the passage 58.

When the control valve 36 is moved to the o position, as shown in Fig. 2, it will be seen that communication between passages 34 and 35 is blocked by the land 51 so that the reversing valve 38 cannot be moved upwardly. Accordingly, at this time, the stroke of the piston 24 will be extended to the right, as viewed in Fig. 2, beyond its normal stroke end, and will come to rest in the position depicted in Fig. 2.

With particular reference to Fig. 5, the valve guide 32 is formed with a drain port 45 adjacent the end closed by plate 22. In addition, this end of the valve guide communicates with a passage 72 that connects with a washer outlet port 73. The passage 72 also connects with a vservo chamber 74 through a one-way ball type check valve 75. The servo chamber 74 is interconnected with the valve guide 32 by passages 70 and 76. In addition, the servo chamber 74 is connected to drain through ports 71 and 77. A plunger 78 having an intermediate annular groove 79 and an internal recess 80 is reciprocably disposed within the servo chamber 74. The plunger 78 has a small bleed orice 81 in the head surface thereof and is biased to the position shown in Fig. 5 by a compression spring 82.

The control valve 36 carries a cap member 83, which constitutes a seat for one end of a compression spring 84 encompassing the control valve 36. The other end of the compression spring seats against a flange-shaped cup member 85, likewise, attached to the valve member 36. The spring 84 normally maintains the flange of the cup-shaped member 83 in engagement with the flange of the cup-shaped member 85. However, when the control valve 36 is in the off position, as seen in Figs. 2 and 5, the control valve plunger 36 can be depressed against compression spring 84, thereby moving the cupshaped member 83 relative to the cup-shaped member 85. In so doing, the passage 72 is connected to the pressure souce from passage 58 through drilled passage 86, which intersects the passage 58, one end of the drilled passage being closed by a plug 87. Thus, pressure fluid will be supplied to the port 73 and also to the servo chamber 74, which causes the plunger 78 to move downward into engagement with the plate 21. When the plunger 78 is in engagement with the plate 21, the drain port 71 is blocked by the upper plunger land, and passages 70 and 76 are interconnected. Since passage 70 connects with the annular groove 55 of the control valve, which is connected by means of passages 34, 39, 41, 40 and 33 to the pressure passage 58 through drilled passage 86, pressure uid will be applied through annular groove 56 to the lower end of the valve guide 37, thereby initiating operation of the wiper motor.

With particular reference to Fig. 7, the wiper motor and washer actuator disclosed in Figs. 1 through 6' is designed for use with a washer pump including a liquid solvent reservoir 88 having a pump housing 89 disposed therein. The pump housing includes a pumping chamber 90 having a reciprocable piston 91 therein, which is connected by a rod 92 to a motor piston 93. The motor piston is disposed within a cylinder 94 having a port 95 adapted for connection with the washer port 73. In Fig. 7, the motor piston 93 is shown in the position it assumes after completion of the intake stroke. In other words, the cylinder 94 is pressurized by uid from the wiper motor through ports 73 and 95. During downward movement of the piston 93, the piston 91 is, likewise, moved downwardly by the rod 92, thereby compressing a spring 96 interposed between the piston 93 and the pump housing 89. During the intake stroke of the pump, solvent is drawn thorugh a screen 97 in the intake pipe 98, a check valve 97a, and passages 99, 100 and 101 .throughout the fseveral views. washerfactuator.assembly disclosed in Figs. vSthrough 13 'is `identical with :that disclosed inFigs. l through .5, exceptlforithewasher actuator and manual control'valve. In the second:em'bodiment,f\t`hetassembly is designed .lor

to -the pumping:` chamber 90. When .the `portg95is ;con Vnected to drainthrough vport 73, passage 7.2;and port 4 5, the spring 96 will effect upward movement .ofthe pistons 91,andV 93, thereby 'discharging liquid'solvent `throughipassages 102, 103 and `104fthroughfcheck valve 105 to the rdelivery .conduit 1106 which connects 'with' the washer nozzles .of a-motor vehicle, not-shown.

Whenthe manualcontrolevalve 36 isareleasedso that 81 under the urge of spring 82 so thattheplunger 7 8 will gradually return `to `its normal posi-tion, as fshown inFigpS. `:Hou/ever, until idrainport 71 is uncovered-by .the ,upperland'of the plunger 78, operation -of the wiper motor will continue. As1soonas Vthe lower land on the plunger -78rcloses"thexpassage 7.6,-the wiper motor piston `24 vwillsbe moved to theparked position,ias1seen in Fig.

2. .,Thusthe:coordinator means of the irstzembodiment of this vvinvention initiates foperation `of vthewiper Vmotor when the delivery stroke of the washerfpumpg is begun,

vandtimes .the operation of Vthe wiperrmotor duringthe delivery stroke of-thezpump, the timing being accomplished bythe :dashpotimeanscomprisinggthe spring 82 and the bleed orice `8,1. Preferably, the size of the bleed orice 81 isschosen so that the wiper motor'piston 24 will make yseveral lstrokes after completion of the .-washer pump delivery stroke so asto dry the windshield.

With lparticular'reference tofFigs. 8 through 14, the second embodiment of the present inventionzwill be described, .similar numerals depicting the several parts `The vwiper motor and use with a washer pump havingsa hydraulically :actuated vdelivery stroke and a yspring actuated `intake stroke.

Moreover,.-in'the embodiment: the manual lcontrol valve 36 must: be continually depressed throughout4 the delivery Istroke, sincey whenithe-manualcontrol valve l36 'is `de- ;pressed, ,uid .under ipressure `from `passage :58 Aflows through drillway 86 to passage72, asseen in Figs. 9. and 12, and toI the servo chamber 74,thereby effecting .down- Vward movement of the plunger 78. At the same time,

fluid under pressure flows through oritice 81 tothe outlet port 111), which isconnected byV afconduitynot shown, to the inlet port 111 of the washer pump depicted in Fig. 14. When the ,servo piston 78 movesradownwardly from the position Vshown `in Fig. Ypassages70 and 76 are interconnected, and ports 71 and' 77 Vare blocked whereby the wipermotor will be activated. VPressuredluidrilowing through port 111 eiects downard 'movementrof a `washerrmotorpiston 112 disposed within a casing 113. The piston 112 is connected by a rod 114 to a pump piston 115 disposed within a casing 116. The casing 116 is disposed within a liquid solvent reservoir 117, and communicates with an intake pipe 118 through a screen 119 and a check valve 119a, and With outlet conduit 120 through a check valve 121. Accordingly, upon downward movement of the pistons 112 and 115, liquid solvent will be discharged onto the windshield in a conventional manner.

When the manual control valve 36 is moved back to the o position, the passage 72 is disconnected from the source of pressure fluid and since at this time, the total fluid pressures on opposite sides of the servo plunger 78 are equal, the spring 82 will gradually move the plunger 78 back to the position of Fig. 10. When the servo plunger 78. assumes its Fig. l() position, communication between passages 70 and 76 will be interrupted, with passage 70 connected to drain port 71 through annular groove 79 so that the wiper motor will be parked. Thereafter, spring 122 within the casing 113 will effect upward movement of the pistons 112 and 1,15 to com- :pleteI the intake; stroke .ofthe washeipump and discharge `the fluid inthe casing 113'to drain :through ports-111, 110,` and-drain l,port A77.

'From the toregoingit lis apparent-thaLthepresent invention results `in Va unique wiper motor and-washer .actuator assembly ofv compact design lwhichcantbefem- Vployed .'toietfect automatic and `coordinated operation of a windshield wiper and a fwasherpump. vMoreover, in -one embodiment,-operation of .the wiper motor -is timed during the entire wash cycle, :as well .as for a short period thereafter, while in lthe second embodiment, operation of the wiper 'motors is only timed after completion of the delivery fstorke ofthe washer pump.

While the embodiments of the vpresent invention as herein disclosed, constitute p.,preferred formys,-it is tobe Vunderstood that other -formsmight be adopted.

yWhat is claimed is as follows:

1. A windshield cleaning -system including in` combination, ,a 'uidf pressure operated motor and `washer pump combination including means connecting the` motor and the pump, a windshieldwiper motor and actuatorasvsemblycomprising7 ahousinghaving a bore therein, a

movable member disposed within said bore capable of fluid pressure actuation in both directions, reversing valve means for 'maintaining said member in a state of continuous umovement and manual control Avalve means for interrupt- `ing operation of said reversing valve- -means so .as `to parl; said movable member, and valve lmeanscontrolled by said ,manualcontrol Valve means for eiiecting simultaneous Aoperationol said motor and washerppump combination and vsaid wiper, motor.

v.2. A windshieldcleaning system including in comn binatiomga fluid ,pressure operated motor and washer zpurnp'combinationV includingmeans connecting the motor and fthepurnp, a windshieldwipermotor and actuator .assembl-y, comprising, a housing-having a bore therein,

a movablegmember disposed within-.said--bore capableof fluid pressure actuation in both directions, reversing valve Vmeans Vfor maintaining saidA member in a Astateof continuous movement throughout a running :stroke and Ymanual controlvalve means iforjinterrupting operation ofizsaid reversing'valve means1 and extending the stroke iofesaidrmeniber beyond said `running stroke to park said ,member, ,and1servo yactuated valve means controlled..by

said manual Vcontrol valve means for initiating :simultaneous'operation Vof said motor and washer pumplcom- ,bination and said wiper motor and timing the operation of said wiper motor.

3. `A windshield cleaning system'including in `combination, a fluid pressureroperated motor and awasher pump combination including, means connectingthetmotor and the pump, ,a ,windshield wiper'motor and actuator assembly, comprising, a housing having a boretherein, ,a1movable:membersdisposed within said bmecapabIe of Iviluid-pressure,.actuationfin both directions, servo actuated reversing valve means for maintaining said member in a state of continuous movement throughout a running range and manual control valve means for interrupting operation of said reversing valve means so as to extend the stroke of said member beyond said running range and park the member, and servo actuated valve means controlled by said manual control valve means for effecting simultaneous operation of said motor and washer pump combination and said wiper motor.

4. A windshield cleaning system including in combination, a uid pressure operated motor and washer pump combination including means connecting the motor and the pump, a windshield wiper motor and actuator assembly, comprising, a housing having a bore therein, a movable member disposed within said bore capable of iluid pressure actuation in both directions, said member dividing said bore into two chambers, reversing valve means for alternately directing pressure iluid to opposite chambers of said bore to effect continuous movement of said member and manual control valve means for f 7 interrupting operation of said reversing valve means so as to park said movable member, and servo actuated valve means controlled by said manual control valve means for effecting simultaneous operation of said motor and washer pump combination and said wiper motor and timing the operation of said wiper motor.

5. A windshield cleaning system including in combination, a uid pressure operated motor and washer pump combination including means connecting the motor and the pump, a windshield wiper motor and actuator assembly, comprising, a housing having a bore therein, a movable member disposed within said bore capable of fluid pressure actuation in both directions, said membed dividing said bore into two chambers, servo actuated reversing valve means carried by said member and movable relative thereto and alternately directing pressure uid to opposite chambers of said bore so as to effect movement of said member throughout a running range and manual control valve means for interrupting operation of said reversing valve means to extend the stroke of said member outside of said running range, and valve means controlled by said manual control valve means for effecting simultaneous operation of said motor and washer pump combination and said wiper motor.

6. A windshield cleaning system including in combination, a fluid pressure operated motor and washer pump combination including means connecting the motor and the pump, a windshield wiper motor and actuator assembly, comprising, a housing having a bore therein, a reciprocable piston disposed in said bore, said piston dividing said bore into two chambers, servo actuated reversing valve means carried by the piston and movable relative thereto for alternately directing pressure fluid to opposite chambers of said bore so as to effect continuous piston movement throughout a running range and manual control valve means for interrupting operation of said reversing valve means to park the piston outside of said running range, and valve means controlled by said manual control valve Imeans for effecting simultaneous operation of said motor and washer pump combination and said wiper motor.

7. A windshield cleaning system including in combination, a fluid pressure operated motor and washer pump combination including means connecting the motor and the pump, a windshield wiper motor and actuator assembly, comprising, a housing having a bore therein, a reciprocable piston disposed in said bore, said piston dividing said bore into two chambers, servo actuated reversing valve means carried by the` piston and movable relative thereto for alternately directing pressure fluid to opposite chambers of said bore so as to effect continuous piston movement throughout a running range and manual control valve means operable to prevent servo actuation of said reversing valve means in one direction extend the stroke of said piston outside of the running range, and servo actuated valve means controlled by said manual control means for initiating operation of said motor and washer pump combination and said wiper motor and timing the operation of said wiper motor.

8. A windshield cleaning system including in combination, a fluid pressure operated motor and washer pump combination including means connecting the motor and the pump, a windshield wiper motor and actuator assembly, comprising, a housing having a bore therein, a reciprocable piston disposed in said bore, said piston dividing said bore into two chambers, servo actuated reversing valve means carried by the piston and movable relative thereto for alternately directing pressure fluid to opposite chambers of vsaid bore so as to effect continuous piston movement throughout a running range and manual control valve means having an on position, an off position for interrupting operation of said reversing valve means and a wash position, and valve means actuated when said manual control valve means is in the wash position for effecting simultaneous operation of said motor and washer pump combination and said wiper motor.

9. The combination set forth in claim 8 wherein said last recited valve means includes a servo actuated plunger.

l0. The combination set forth in claim 9 wherein said servo actuated plunger has a bleed orifice in the head thereof and is spring-biased in one direction.

11. The combination set forth in claim 8 wherein said washer pump has a fluid pressure effected delivery stroke and a spring actuated intake stroke, and wherein said last recited valve means times the interval of wiper motor operation after completion of said delivery stroke.

12. The combination set forth in claim 8 wherein said washer pump has a fluid pressure effected intake stroke and a spring actuated delivery stroke, and wherein said last recited valve means times the interval of wiper motor operation commencing with initiation of the delivery stroke of said washer.

13. The combination set forth in claim l2 wherein said manual control Valve means includes yieldable stop means when it is in the olf position, whereby the manual control valve means may be depressed to the wash position and will automatically return to the off position when released.

14. The combination set forth in claim 8 wherein said last recited valve means, when actuated, completes a flow path to the reversing valve means of said motor with the manual control valve means in the off position.

References Cited in the file of this patent UNITED STATES PATENTS 2,743,473 Oishei May 1, 1956 2,769,194 Oishei Nov. 6, 1956 2,789,544 Dermond Apr. 23, 1957 

